I just wanted to say, very nice app and a cool, clean interface. Although I've only scratched the surface, the feeling of power you get when importing and manipulating tables is positively heady!

You might want to set minimum sizes on the dialogs (e.g. options, export) since they can be shrunk until controls start overlapping. I like the way you matched the AUI caption buttons to the Mozilla style. Is the toolbar your new AUI-centric one? It's very nice.

Yes the toolbar is our new wxAuiToolBar class, which we'll be releasing shortly. It's meant to work better with wxAUI than the standard toolbar (mainly issues with gradients and decorations, like grippers). The toolbar itself has different modes, one of which you see here. The other mode is the more traditional one where you can drag toolbars around. After carefully considering our user interface, we went with a fixed toolbar.